Bug#791142: libmusicbrainz5: library transition may be needed when GCC 5 is the default

[Sebastian Ramacher]

Control: tags -1 + pending

On 2015-07-03 13:11:46, Matthias Klose wrote:
> Package: src:libmusicbrainz5
> Version: 5.1.0-3
> Severity: important
> Tags: sid stretch
> User: debian-gcc at lists.debian.org
> Usertags: libstdc++-cxx11
> 
> Background [1]: libstdc++6 introduces a new ABI to conform to the
> C++11 standard, but keeps the old ABI to not break existing binaries.
> Packages which are built with g++-5 from experimental (not the one
> from testing/unstable) are using the new ABI.  Libraries built from
> this source package export some of the new __cxx11 or B5cxx11 symbols,
> and dropping other symbols.  If these symbols are part of the API of
> the library, then this rebuild with g++-5 will trigger a transition
> for the library.
> 
> What is needed:
> 
>  - Rebuild the library using g++/g++-5 from experimental. Note that
>    most likely all C++ libraries within the build dependencies need
>    a rebuild too. You can find the log for a rebuild in
>      https://people.debian.org/~doko/logs/gcc5-20150701/
>    Search for "BEGIN GCC CXX11" in the log.
> 
>  - Decide if the symbols matching __cxx11 or B5cxx11 are part of the
>    library API, and are used by the reverse dependencies of the
>    library.

Yes, the symbols are part of the API and are used by reverse dependencies.

>  - If a library transition is needed, please prepare for the change.
>    Rename the library package, append "v5" to the name of the package
>    (e.g. libfoo2 -> libfoo2v5).

A version bumping the SONAME has been uploaded to experimental. I'll file a
transition bug once it passed NEW.

Cheers
-- 
Sebastian Ramacher
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